Finding the Fourth Proportional to 103,697.35, 155,710.05 and 78,765.55

Step by Step Solution

1. Step 1: Write the proportion equation
   103,697.35 : 155,710.05 = 78,765.55 : x
2. Step 2: Convert to fraction form
   103,697.35/155,710.05 = 78,765.55/x
3. Step 3: Cross multiply
   103,697.35x = 155,710.05 × 78,765.55
4. Step 4: Simplify right side
   103,697.35x = 12,264,587,728.78
5. Step 5: Solve for x
   x = 12,264,587,728.78/103,697.35
6. Step 6: Final answer
   x = 118,272.91